yajl: add EPICS_YAJL_API_VERSION macro

src/libCom/Makefile

@@ -63,4 +63,5 @@ include $(LIBCOM)/error/RULES
 include $(LIBCOM)/flex/RULES
 include $(LIBCOM)/misc/RULES
 include $(LIBCOM)/osi/RULES
+include $(LIBCOM)/yajl/RULES
 

src/libCom/yajl/RULES

@@ -0,0 +1,17 @@
+#*************************************************************************
+# Copyright (c) 2010 UChicago Argonne LLC, as Operator of Argonne
+#     National Laboratory.
+# EPICS BASE is distributed subject to a Software License Agreement found
+# in file LICENSE that is included with this distribution.
+#*************************************************************************
+
+# This is a Makefile fragment, see src/libCom/Makefile.
+
+# Ensure epicsVersion.h gets built first
+yajl$(DEP): $(COMMON_DIR)/epicsVersion.h
+yajl_alloc$(DEP): $(COMMON_DIR)/epicsVersion.h
+yajl_buf$(DEP): $(COMMON_DIR)/epicsVersion.h
+yajl_encode$(DEP): $(COMMON_DIR)/epicsVersion.h
+yajl_gen$(DEP): $(COMMON_DIR)/epicsVersion.h
+yajl_lex$(DEP): $(COMMON_DIR)/epicsVersion.h
+yajl_parser$(DEP): $(COMMON_DIR)/epicsVersion.h

src/libCom/yajl/yajl_common.h

@@ -20,10 +20,26 @@
 #include <stddef.h>
 #include <shareLib.h>
 
+#include <epicsVersion.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif    
 
+/** YAJL API history in brief
+ *
+ * Originally macro not defined
+ *   YAJL 1.0.12
+ *   Bundled with EPICS Base 3.15.0.1
+ *
+ * YAJL 2.1.0
+ *   Changes argument type for yajl_integer() from 'int' to 'long long'
+ *   Changes argument type for yajl_string() and yajl_map_key() from 'unsigned' to 'size_t'
+ *   Replacement of struct yajl_parser_config with yajl_config()
+ *   Replacement of yajl_parse_complete() with yajl_complete_parse()
+ */
+#define EPICS_YAJL_VERSION VERSION_INT(2,1,0,0)
+
 #define YAJL_MAX_DEPTH 128
 
 #define YAJL_API epicsShareFunc